The three-day event started on Wednesday at the field days Waimumu site, near Gore.
Mr Henderson said public attendance was probably the highest in history.
On Wednesday, the public were queuing up to enter the grounds at 8.30am.
"We had people coming in left, right and centre and lines everywhere."
When the volume of people turned up on the first day, it was a relief, as the 2022 event had been cancelled because of Covid.
It was like the event could not cash in on the success of the previous event and the committee were starting from scratch, Mr Henderson said.
"There was no momentum.
"We were pretty overwhelmed."
He estimated 15,000 attended on Wednesday, 12,000 on Thursday and 17,000 yesterday.
The wet weather on Thursday had kept some people away.
Those who were there spent more time in tents sheltering from the rain and talking to representatives which had been good for exhibitors.
The carparks on Friday were overflowing and one committee member commented he had never seen so many people attend, he said.
It had been a good season for farmers, which may also have contributed to the attendance.
"People have got grass ... and most people are up-to-date with their work."
There seemed to be a good demand for machinery, especially motorbikes, Mr Henderson said.
Overall, he was very pleased.
"Huge numbers through the gates, the exhibitors are happy, the public’s happy, plenty of positivity."
It was the first time Harry Rufford, 12, of Arthurton, had attended the field days.
He enjoyed the day out, Harry said.
"There’s heaps of stuff you can go see."
He especially liked watching the modified tractors being used in the field days’ tractor pull competition.
"They’re real quick."
